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In this article, we will learn about Byobu on the Ubuntu 16.04, Byobu which is a terminal multiplexer and easy to use, Byobu is used to have multiple windows, consoles and split panes within the windows and will also show the status badges and notifications on the terminal.To complete this tutorial we needed an Ubuntu 16.04 installed and a Linux user with sudo permissions.Installing or Checking the ByobuAs a default feature of Ubuntu 16.04, Byobu is installed. However, as a practice, we will check the installation and version and if not we will install the Byobu.To check the Byobu is ... Read More
On a fine blue Monday morning, the customer sent you an email for urgent video call. You, being a good Project Manager, the project’s progress status and all other details you always kept at your bay. So, without any second thought, you jumped to the video call and start discussing with your client.After your initial exchange of pleasantries, suddenly the client complained that you are going in a wrong direction. He has gone through the application you have released yesterday at the end of first phase and he is totally disappointed that the requirements he has mentioned initially are different ... Read More
JDBC is acronym of Java database connectivity. It is used to connect your application to the database and transactions . It is an open source Java api. Hibernate is also used for connect your application to database and to do database related transactions but with different approach. It has a object relationship library which mapped the tables and columns of the database with the java object. It enables object oriented programming in database. Hibernate provides HQL to access the data from the database. Sr. No.KeyJDBCHibernate1Basic It is database connectivity technology It is a framework, 2Lazy Loading It does not support lazy loading Hibernate support ... Read More
IntBinaryOperator is a functional interface in Java 8 from java.util.function package. This interface expects two parameters of type int as input and produces an int type result. IntBinaryOperator can be used as an assignment target for a lambda expression or method reference. It contains only one abstract method: applyAsInt().Syntax@FunctionalInterface public interface IntBinaryOperator { int applyAsInt(int left, int right) }Exampleimport java.util.function.*; public class IntBinaryOperatorTest { public static void main(String[] args) { IntBinaryOperator test1 = (a, b) -> a + b; // lambda expression System.out.println("Addition of two parameters: " + test1.applyAsInt(10, 20)); IntFunction test2 = new IntFunction() { ... Read More
Function interface is a functional interface from java.util.function package. This interface expects one argument as input and produces a result. Function interface can be used as an assignment target for a lambda expression or method reference. It contains one abstract method: apply(), two default methods: andThen() and compose() and one static method: identity().Syntax@FunctionalInterface public interface Function { R apply(T t); }Exampleimport java.util.function.Function; public class FunctionTest { public static void main(String[] args) { Function f1 = i -> i*4; // lambda System.out.println(f1.apply(3)); Function f2 = i -> i+4; // lambda ... Read More
DoubleSupplier interface is a built-in functional interface defined in java.util.function package. This functional interface doesn’t expect any input but produces a double-valued output. DoubleSupplier interface can be used as an assignment target for lambda expression and method reference. This interface contains only one abstract method: getAsDouble().Syntax@FunctionalInterface public interface DoubleSupplier { double getAsDouble(); }Example of Lambda Expressionimport java.util.concurrent.ThreadLocalRandom; import java.util.function.DoubleSupplier; public class DoubleSupplierLambdaTest { public static void main(String args[]) { DoubleSupplier getRandomDouble = () -> { // lambda expression double doubleVal = ThreadLocalRandom.current().nextDouble(0000, 9999); return Math.round(doubleVal); }; ... Read More
The functional interface is a simple interface with only one abstract method. A lambda expression can be used through a functional interface in Java 8. We can declare our own/custom functional interface by defining the Single Abstract Method (SAM) in an interface.Syntaxinterface CustomInterface { // abtstact method }Example@FunctionalInterface interface CustomFunctionalInterface { void display(); } public class FunctionInterfaceLambdaTest { public static void main(String args[]) { // Using Anonymous inner class CustomFunctionalInterface test1 = new CustomFunctionalInterface() { public void display() { System.out.println("Display using Anonymous inner class"); ... Read More
ObjLongConsumer is a functional interface from java.util.function package. This interface accepts an object-valued and long-valued argument as input but doesn't produce any output. ObjLongConsumer can be used as an assignment target for lambda expression and method reference and contains only one abstract method: accept().Syntax@FunctionalInterface public interface ObjLongConsumer { void accept(T t, long value) }Exampleimport java.util.function.ObjLongConsumer; public class ObjLongConsumerTest { public static void main(String[] args) { ObjLongConsumer olc = (employee, number) -> { // lambda expression if(employee != null) { System.out.println("Employee Name: " + employee.getEmpName()); ... Read More
A functional interface is a special kind of interface with exactly one abstract method in which lambda expression parameters and return types are matched. It provides target types for lambda expressions and method references.Rules for a functional interfaceA functional interface must have exactly one abstract method.A functional interface has any number of default methods because they are not abstract and implementation already provided by the same.A functional interface declares an abstract method overriding one of the public methods from java.lang.Object still considered as functional interface. The reason is any implementation class to this interface can have implementation for this abstract method either from ... Read More
LongFunction is an in-built functional interface defined in java.util.function package. This functional interface expects a long-valued parameter as input and produces a result. LongFunction interface can be used as an assignment target for a lambda expression or method reference. It contains only one abstract method: apply().Syntax@FunctionalInterface public interface LongFunction { R apply(long value) }Exampleimport java.util.function.LongFunction; public class LongFunctionTest { public static void main(String[] args) { LongFunction function1 = (long i) -> { // lambda expression return i + i; }; System.out.println("Using Lambda Expression: " + function1.apply(10)); LongFunction ... Read More